My Rule of 10. Must have at least 10 or a numbered amount listed in the advertising for people to know how much is available now. With prior notice 24 hours in paper, email, text, etc. For instance, Ibuprophen will be on sale tomorrow for 2.99 quantity limited to 100. Simple to the point, no nonsense. I can get up early get to the store when it opens and hope to get what I want for the price advertised. If they run out thats ok, since I knew how much was being sold and what time I needed to be there for the sale. DM